My ex-boyfriend is acting strange. Guys explain this to me please.

One min he tells me how he feels how he cares and love me.The next min he is throwing stuff in my face and saying things like we won't ever be together again.When he is the one that texts me and contacts me.And he has a new girlfriend just before the girlfriend he was engaged after we broke up this happened all in the same yr.What is his problem?
My ex-boyfriend is acting strange. Guys explain this to me please.
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